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etched ndere' oai-.VIN gs. Davis, or oRoNo, AssIeNoR ToHIMsELr AND THOMAS N.

EGERY, OF BANGOR. lMAINE.

Letters Patent Ne. 97,484, dated December 7, 1869.

IMPROVEMENT IN CIiAPBOARD-MACHINE..

The Schedule referred to in these Letters Ptent and making pant of the same.

To-all whom it Imay concern `Be it known that I, CALVIN S; DAVIS, of Orono, in the county of Penobscot, aud State of Maine, have invented certain new and useful Improvements in Glapboard-Machiues; and I do hereby declare that the following is a full and exact' description thereof, reference being had to the accompanying drawings, and to the letters of reference4 marked thereon.

My invention consists in the use of adjustable sappers, of peculiar construction, and applied to the outside collar, in a novel manner.

In the accompanying drawings- Figure isa perspective' view of. the shaft A, pnlley li, saw S, small outside collar E, carrying the sappers f g, and of the nutN. K

Figure 2 is perspective view of shaft A, pulleyV b, small shoulder c, key n, and large inside collar B.

Figure 3 is a longitudinal` view of shaft A, pulley 'b, shoulder c, key n, small inside collar D, and .small 'mitside collar E, carrying the sappers fg.

Figure 4 is a front view oi' large outside collar' C, with sappers f gand set-screws 'fi Ir.

Figure is a view of that face of outside' collar which presses against the saw.

Figure is a rear'view of large inside collar B.

Figure 7 is a view of fragment of the; saw S.

Figure 8 is a perspective View of the saunas overliung in a elapboard-uiachine.

,flo enable others skilled 'in the artto' make anduse my invention, I will now proceed to describe its construction and operation.

I construct the shaft A, and provide the saine with the pulley b, shoulder c, and key a, as shown in' figs. 2 4and 3.

The end of the shaft is threaded, to receivethe nut N, as shown in figs. y3 and l.

The pulley b is situated entirely in the rear of the machine, and distant from the saw, as shown in the drawings, and the saw is overhung, as shown in iig. S. I construct a series of removable and adjustable collars, ci various diameters, two sizes/ot' which are showll in the drawings, viz, small size, ll D, 3

i and 1, and large size, BU, ligs. 2, (i, 4, and 5.

The inside collars, altl ough of different diameters,l

are of the same thickne The large inside collars, however, are provided with aV `flange, as shown iii-figs. 2 and (i, so as to fit over the The inside collar 1), fig. 3, is Vplaced upon the shaft, and pressed back to the shoulder c.

The saw S is placed on the shaft, andvpressed hack to the collar D.

-lheV outside collar E Vis placed on the shaft, and

" pressed back to the saw S.

,lfhe collar D, saw-S, and collar E, are prevented from turning upon the shaft by the key n, and are held firmly in place against the shoulder c, by bindingr` nut N, `fig. l.

The sappers fv g, which, fer the purpose ot'- adjustment, move freely in the slots in `the collar, are first Vadjusted according to the diameter or size Koi' the saw, and then secured byturningiilc screwsj r, figs. 4 and l.

The sappers are vthus held between the face of Vthe saw and the set-screws.

The resultant pressure does not bend the saw, the saw being sustained by the inside collar.

Withlarger saws, larger collars are used on both sides of the saw,

The adjustable collars arc inteuded'to keep the saws stiti' and true,.so that they can stand rapidity ot' motion and feed.

By means of these collars, it evident that saws of `different sizes. may be'used upon the same shaft, and

that as a saw is worndown in use` it may be readily fitted with smaller collars.

As before mentioned, the inside collars are all of the 'tionary' collar by bolts and nuts, the 4saw is eentre' hung between the bearings, and the pulley is close to the saw.

It will be readily seen, that` as in such case the collar is stationary, or permanently fixed to the shaft, the size of the saw which can be used depends on the sizeof the fixed collar; for a saw much larger than the collar is not s tilened by the collar, so as to stand speed oi' revolution or rapidity of feed, and then as soon as the saw is wrn down about two inches, the 'stationary collar strikes the elapboard-holt, and the sahr has to be thrown aside. l

Again, in order to change the centre-hung saw, theI shaft must he raised from its bearings, and the various Y nuts and bolts removed and replaced-an operation, practically, of hours duration.v l

Again, in ordinarj machines, the saw is so nearthe pulley, that the clapb'oard-bolt is apt to interfere, in various ways, with the belt driving thev pulley.

Again, the sappers themselves, as heretofore used,

are slotted, and held ou stationary collars, and adjusted, each, by two set-screws through the slots, and therefore, when somewhat worn, must be removed and repointcd, as they cannot be ground down much to the slots.

In my improved clapboard-machine, a much larger vsaw can be used; the ordinary saw -can beworn down six inches or more; c l-h'e saw can'be removed and an- Y other hung in ve minutes, rendering it practicableto remove the sawvforling, the machine operating with another saw while the filing is being done the clap'- hoard-holt does not interfere with the belts; the sap- ,owing Y the same crew) I can saw a thousand more clapboards per diemvwith my machine, thanI with any machine known to me, unprovided with my improvements.

The state of the artis s0 well known, that I have not considered it necessary to show or describe the method of communicating motion to the shaft, or the carriage for feeding the olapboard-bolt to the saw. I

usev the ordinary gears, belts, and carriage upon my machine.

I claim the combination, wit-h a circular saw, of adjustable sappers fg, lying in transverse grooves in the collars, and flush with its surface, and set-screws to hold them to place against the face of the saw, all substantially as shown and described.

CALVIN S. DAVIS.v

Witnesses:

FRED. O. OooMBs, Guo. WING. 

